urobilinogen

(redirected from fecal urobilinogen)
Also found in: Dictionary, Thesaurus, Encyclopedia.

urobilinogen

 [u″ro-bi-lin´o-jen]
a colorless compound formed in the intestines by the reduction of bilirubin; the urobilinogen in the urine normally represents about 1 per cent of the bilirubin produced in the body by the breakdown of hemoglobin. Increased amounts in the urine indicate excessive bilirubin in the blood. Determination of the amount of urobilinogen excreted in a given period makes it possible to evaluate certain types of hemolytic anemia and also is of help in diagnosing liver dysfunction.



Laboratory tests for urobilinogen require collection of urine for a 24-hour period or for a 2-hour period. The 2-hour afternoon collection of urine is most commonly used because it is more convenient and also because it has been found that the excretion of urobilinogen reaches its maximum in the period from midafternoon to late evening. There is no special preparation of the patient for these tests. The exact time period in which the urine has been collected must be noted. The specimen should be taken to the laboratory immediately, since bacteria that may be present in the urine can oxidize urobilinogen and change it to urobilin.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

u·ro·bi·lin·o·gen

(yūr'ō-bī-lin'ō-jen),
Precursor of urobilin.
Farlex Partner Medical Dictionary © Farlex 2012

u·ro·bi·lin·o·gen

(yūr'ō-bi-lin'ō-jen)
Precursor of urobilin.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

urobilinogen

A pigment formed from BILIRUBIN in the intestine by bacterial action that is absorbed into the bloodstream and excreted in the urine. Excess is found in the urine in HAEMOLYTIC ANAEMIA and certain liver disorders. None is found in complete obstruction to the the outflow of bile from the liver.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005